>>2827 For me, the problem with square is that it can be difficult to align the screwdriver quickly with the screw - for that reason, personally I prefer the Torx over all of them. I accidentally bought some Torx internal screws a while back, and liked them so much they're now my default.
I don't have a clue, but I have a hunch that says the slot-square combo would be the best because maybe it's slightly easier to manufacture, which matters because there are what, hundreds of million of screws being made every year? And they look difficult to wear down to the point of being unscrewable.
Torx is close to mathematically optimal. The only real down-side is that a) it's quite hard to distinguish the sizes by eye and b) it's quite easy to chew up a screw head by using an under-sized bit. It's perfect for manufacturing, but slightly annoying during servicing and repair.
I've probably had the least grief with internal hex, but it's not suitable for a lot of applications due to size constraints. External hex is still probably the best option for tough environments subject to abrasion or corrosion, but those buggers owe me a lot of knuckle skin.
"Cross-head" is an absolute shit-show, because there are so many almost-compatible standards.
Pentalobe can fuck off. Tri-point can fuck off, come back and then fuck off again.
My favourite is the Pitlock, which is the only removable security bolt I've used that is actually secure. Totally niche, but invaluable if you need it.
Internal hex for countersunk, external for when you really mean it. Though I think this is just an admission that I prefer bolts, but that's a whole other discussion.
I'll admit I've had limited strife with posidrive, I've rounded maybe two in the last decade, and I interact with them almost daily.
I think we can all agree slotted is a joke - I curse whatever backwards farmer built my house every time I find one.
I should qualify that I accept that many other solutions may be technically better, but the availability of specialist bits is a huge letdown for me. You can't really bodge a torx like you can a posi/phillips or slotted, and fiddling with often fragile driver bits is a real turn off - ironically any sort of torque applied through a torx bit will snap the bit easily. Maybe I could just buy more expensive torx bits, but fuck you - I've never once snapped a Philips bit.
